A141125 Hankel transform of a transform of Fibonacci numbers.

1, 4, -4, -16, 16, 64, -64, -256, 256, 1024, -1024, -4096, 4096, 16384, -16384, -65536, 65536, 262144, -262144, -1048576, 1048576, 4194304, -4194304, -16777216, 16777216, 67108864, -67108864, -268435456, 268435456

Offset

0,2

Comments

Hankel transform of A100095(n+1).

Links

Table of n, a(n) for n=0..28.

Formula

G.f.: (1+4x)/(1+4x^2); a(n)=2^n*(cos(pi*n/2)+2*sin(pi*n/2)).

a(n+3) = a(n+2)*a(n+1)/a(n). [Reinhard Zumkeller, Mar 04 2011]

Crossrefs

Cf. A141124.

Sequence in context: A218522 A303072 A231839 * A164111 A056450 A164906

Adjacent sequences: A141122 A141123 A141124 * A141126 A141127 A141128

Keyword

easy,sign

Author

Paul Barry, Jun 05 2008

Status

approved